航空科学技术2023，Vol.34Issue(12)：59-68,10.DOI:10.19452/j.issn1007-5453.2023.12.007
航空发动机燃油管路概率疲劳极限测试方法
Test Method for Probabilistic Fatigue Limit of Aviation Engine Fuel Tubes
摘要
Abstract
Determining the fatigue limit of tube is important for avoiding fatigue failure of aviation engine fuel structures.In this paper,the rotational bending fatigue tests were conducted on empty tubes and pressurized tubes(13.5MPa)respectively.Two strain gauges were used to monitor the dynamic stress caused by inertia during eccentric rotation.Based on the Gerber model,stress corrections were made to the asymmetric cyclic load caused by internal pressure,and the differences in the fatigue failure forms between the empty tubes and pressurized tubes were obtained.The fatigue limits and their standard deviations of the empty pipe and the pressurized pipe were determined through the data of up-down method.Based on the up-down method data,several fatigue tests under high stress levels are supplemented,and the S-N curve of the two type tubes were fitted by the power function model.Finally,the probability statistical analysis method is used to process the test data,and the fatigue limits under different confidence levels and survival rates were obtain.The research results provide the reference for the stress severity values of aircraft fuel tubes design.关键词
旋转弯曲/升降法/S-N曲线/置信度/存活率Key words
rotational bending/up-down method/S-N curve/confidence level/survival rate分类
航空航天引用本文复制引用
刘伟,韩天宇,吕朋蓁,郭闯..航空发动机燃油管路概率疲劳极限测试方法[J].航空科学技术,2023,34(12):59-68,10.基金项目
航空科学基金(2018ZB53016) Aeronautical Science Foundation of China(2018ZB53016) （2018ZB53016）
